EN 55014-2: 1997: Immunity standard for Household goods: #5.1: ESD will be tested to the procedures of IEC 1000-4-2 but "tests with lower voltages than those given in Table 1 (4kV Contact/ 8 kV Air) are not required.:
# 5.6: Surges: Tests with lower voltages than those given in Table 12 (1kV/2kV) are not required, but tests will be carried out in accordance with IEC 1000-4-5. What is right and what is wrong? At least for household we believe that EN 55014-2 takes precedence, and we belt the EUT with the stated levels. But we do a few exploratory runs at lower voltages. For all other immunity standards we start off gradually till we reach the stated limit values, which is the way I believe it should be done. But it increases the time, especially for Surge tests where you got to hit at different points on the sine wave quadrant too. Regards Arun Kaore EMC Engineer ADI Limited Systems Group Test & Evaluation Centre Forrester Road, St Marys NSW 2760 P O Box: 315, St Marys NSW 1790 Tel: 61 2 9673 8375 Fax: 61 2 9673 8321 Email: [email protected] <mailto:[email protected]> -----Original Message----- From: Jim Hulbert [mailto:[email protected]] <mailto:[mailto:[email protected]]> Sent: Friday, 20 August, 1999 0:07 To: [email protected] <mailto:[email protected]> Subject: EN50082-1:1997 & EN55024 Immunity test standards EN50082-1:1997 and EN 55024 call out the basic standards EN61000-4-2 and EN61000-4-5 for ESD and Surge. EN61000-4-2, Section 5 starts out "The preferential range of test levels for the ESD test is given in table 1. Testing shall also be satisfied at the lower levels given in table 1." EN61000-4-5, Section 5 contains similar wording. This is how we perform our compliance tests. We start at the lowest test voltage levels from the respective tables and step up to the test levels called out in EN50082-1/ EN55024 (or higher, depending on our own in-house product spec.) However, I have noticed that some test labs go straight to the levels called out in EN 50082-1/EN55024 and skip testing at the lower levels. I believe this approach is incorrect because it does not conform to the requirements of the basic standard and is simply not a complete test. As explained in EN61000-4-5, the non-linear current-voltage characteristics of the equipment under test should be considered and the test voltage should therefore be increased by steps up to the test level specified in the product standard or test plan. The same rationale applies to ESD testing where current-voltage characteristics are also non-linear. How do others approach these tests? Are we adding unnecessary test time by starting at lower test voltages and stepping our way up or are the test labs that go straight to the maximum test levels overlooking an important aspect of the testing? Jim Hulbert Senior Engineer-EMC Pitney Bowes --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
